"UDS is over! And in the customary wrap-up I stood up and told the audience what the Foundations team have been discussing all week. One of the items is almost certainly going to get a little bit of publicity. We are going to be doing the work to have btrfs as an installation option, and we have not ruled out making it the default. I do stress the emphasis of that statement, a number of things would have to be true for us to take that decision."

Why use a default that Grub can't understand? That makes no sense what so ever. Not to mention that Btrfs is new enough that there aren't many rescue tools that support it. That will create a pain for experts and panic for a novice if they actually need to muck around recovering a system.

I don't pretent to be an expert on the inner workings of GRUB, but I'd imagin that filesystem support can be built into GRUB.

After all, GRUB didn't originally support ZFS but now OpenSolaris can boot ZFS filesystems.

I think the bigger issue is not GRUBs support but rather the fact that BtrFS isn't yet ready for consumer desktops